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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cf11c2f63f42be37e0f535ce8707ba5e74cdb310d79c9cd8f0e2f1c4b889f39' 
  AND token = 'ZvV42PR092dkOeu5LTZ3l+NvaW9u3nW8/9kEhlRxL0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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