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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94d5cc25581269a38cf064f41572ae585871a73219112606648e86f741c61e6' 
  AND token = '0jglH44Mj31KKRXNQRH0I4tIXceONChmvAoe4oU9WSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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