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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '142baf4d997598a2f96f9a586af1bc9dfe3e26858d763308c33bd074e8d8ff64' 
  AND token = 'iCIj7xH3K3J5vmQtsEsCM1JnL99nsUUTG+1OeN71QzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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