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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '405eb7158104d81f1fce547c58eb1ea9551aa2bd7387dad181943cfdfb84123c' 
  AND token = 'dbnJXwd5JNUvsdLy2J91uWWxE+l3k7gIQx1RsqQE32A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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