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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a3c3048f617d970e720eec534b2a37d34c49ef9fe62fcac7366ab00b7428036' 
  AND token = 'hgA2cAdvXPxCWUBCctqCTtfXJWmsL/x5rgqxs19IUg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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