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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae85b142d9877f0a7faffc4c3bf7e836cbb8a43ec918b66ec026de82be02e71d' 
  AND token = '7FH9lu+Wy/wnpPbspowwrgKf8Lc0igDwTouaQWJSqCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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