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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3070a6210dc1582f9fbd0d34f88ae88e1f36050e739d593a9e0121b6688bd039' 
  AND token = 'vjJNqf3yrc3HbSkiGWaXtuX0dXiwvQuDRbInKt6/pcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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