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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a8d6882a48210bbd99b5b70d78eb987bb06f602b30499199bfa1f31223af16' 
  AND token = 'x928ODgJGre2tGgVooNzYo/obeBu1DquYT8+t+3kPk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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