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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '846e35366e17e2f4c7cd6f5008f9fcce15cc74aa92a81ac717b12d76a63a6811' 
  AND token = '9XAp0nd0riNroz9Q1CsDpKq59StN2zSjAFWOGH7yqps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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