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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd25a51931780abcda20035e539250cef001c307dee4a0c7c3d6a789633a7e07' 
  AND token = 'rw5LC8sxUxdTG8PjnIh/pJ0u78dqMnjmrufe+2WJs7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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