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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5da31c098edfcc8fa596fd870247888e2b4d977c0df9ca3aabf199547ca0c03' 
  AND token = 'ITHEP+YXLZHNlwFmkFxpDHM6+4k1aKp782UPxOzjQ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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