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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fe4f4c8c83e9d2e2fedd7402b5c8756502c06a2ce807497de25fb5a748ce097' 
  AND token = 'a/WwZHSQgCR7pwEQBmkUTZw2vrdbAgD/zksL7+m2ffs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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