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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d53c8209de5e0482d447f8748bf624300dcb3f458fa908a9dfd37b02b79aa58' 
  AND token = 'ye0nKt5YkbLQAlVIUcDYUHWNrxOtSNfmnIVm5rpzdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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