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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13275964bb268afab4b9f9859318b9caaeb0ff1b12a04f3ca5c69cb2de570420' 
  AND token = 'GzhtCtZFCDLwPctwtR4Te6zv/cZHa0oXI4mtAu156sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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