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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0207942bf58897bb7aedea277f9ec215be2ebe5e65c9a98ec2a1379e32b07cd' 
  AND token = 'C4uCflzaR9hpN2eghbYwf2W1N1lr/Ba2MXjdS79hs+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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