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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '344c767aab18f3aba5d0397faa411872d4ca1fdb39b25f80b407a7aba0db529d' 
  AND token = 'Q1PyMaDPCeDb8FW0LVOYQrABIkxy8IVKJMvnK+hCbNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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