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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c75969247142ee99fe3e4b31f22097e0f559b4e720a52416dd064b1f0f328a05' 
  AND token = 'eW3E4kLp4eTuv2SalQO3xYLkz/CE0iUb9AiRz+qeO0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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