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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95d2aeecf08957818fb33815ccaf918c49042baea61f68679af0cd60f5eff512' 
  AND token = 'SIgdlpDfmWztQq5dWVPVPDFSYblGqy/dn3KToEV9KS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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