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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0bcf78bdc04df96cf73910f125ff9701da15d761deb337168cc18a63d470cfc' 
  AND token = 'O11BOrUyS3pdOw8vfbU9f47boHiVxu99gdN+m7oyKSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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