SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2079c46e340788bb8a11647ab3c4b4ffe4d1475326d8d3957aeb461ce739c4f6' 
  AND token = '5AsQJ0CnVahW4uKGnI2ZxHlYaiEqLF8twvL7D+NsdGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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