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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cddf4c451216131c8c92fac662daca5c16ec9bb03fba9ca8e3b6d8857c9384c' 
  AND token = 'baqko4rwNpxJFNQzebL6hBmAvohxwrk8j0oC8/5lnQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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