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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '828b4fd561d7d188d40d019cde1ee2d8e74907f15443214d041f815eaa287e3b' 
  AND token = '8pjkcO6vMDQCeQPmSTeKyqdIIJx2fs7jhTCiuako5gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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