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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60d6d5b1d27ad2b1ed25ae9e20922156ec90c1755fc6f678171ab26575ba5372' 
  AND token = '638G7kVxo7+bGRooZ85amLYSptaU3yH84WMx+DL6oMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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