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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c91953e6a1869fe7d497c691bb61b2d880def4a1a001e63a2e37aa6b652c77b2' 
  AND token = 'lYfOyRMcS9bPx5eU6WDSJSIl60uiVY/lN16zsLrXrR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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