SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2e015c8c450f1a2c3e88f83bf9078c66f52860478f267d98046a5178bf46251' 
  AND token = '5fDD1SgSZ8L9/+m6osOQxvtvLktKQXz2dUF8Xw+uf70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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