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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e4341fc183af70a7854488780ff6f6420906a06b90ba0c132aee49279e08c07' 
  AND token = 'CJKo6f+rolJD8KY1xP118tmARHzdUgfzTq7nfzPJooQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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