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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ff1e5d08caa0396cbbd22f2366175f0d6263b4d1cae8a6008a0f322371eda8d' 
  AND token = 'ypXxlAaXkEx+pg4atJ2yVNq5E2bDCasYgWwe+XoQTwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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