SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37d6ec1dc789269cf8b81288328e55fe1a84fba7929d5b0ed39f4496bbaf2c61' 
  AND token = 'cOMrCNBdHaNAAMTJLUJiaVGFDgUIJwXlZKR7ygdax/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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