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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2aed3c03738325a4afa5a4b17b4b86118c77d6fc480b49cfed9b265f76b1df5' 
  AND token = 'MDaxNH7HyzZWOddUe7GyvAfDLRUAIu5iS0ETuJm1jw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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