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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c954b42e262e64ea42b2e7acbeba753514c2fe87329c5fc843cba09f97edcdd' 
  AND token = 'vlZ1oqEBibyEdKIQnvFNg7kLtbBS4sYnzxUz0w40iJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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