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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3650303e3eae4c2458796bcf816d83aa7a2f0afd2ab5355e68d5a030c35b89f3' 
  AND token = 'K5cdT3hB1nB3OU0CDCF0O56142hNQ7T2l0aXylxHhLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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