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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '956f10ed33074a0288799ad7321e464e983be1138fe0b9869b6e0f97d0fb016e' 
  AND token = 'TP7E0ciBL8DZZZ7FDktpoI8n8wKS8lUOuoI2xFguQcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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