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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4131e574ac55a530db393b4813c5146db9a58f5ad2741eda6ea28b663b3748c' 
  AND token = 'tdK1IEDhFtCxI2WkerV+82vFY8e2dr7HycyCWX3swvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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