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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2ea7ed0842aaccd339013ee7c29ab8ec7781ba00040a12f998e5baed889afbe' 
  AND token = 'HNMiVIBJgsZY37PgWpAH2sinLtUldPEtgv7t9MKMPqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}