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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3c3f723086c20e0a462a9ecda12b81968627e7a9b20f8421ff74b316cef07ae' 
  AND token = '6Vpn06FArk6aux1lbd0M+Lq3McHbBhNC3A4KfPxMvwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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