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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1423f65da07192089349e93043f2a9be8273d990a9b320a35261c40f7c13245f' 
  AND token = 'JnjHk7sMCmQJmkc42J8/u1Jk4gWlWjTVhmtaiwt0QAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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