SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '371cd2cff0d135378f0a2f5f15d3f5de374bee038764db2edd111e9dfc8f3aa6' 
  AND token = '+W2LQBOpicg8KAHVglriFmfG4PwyX76XulqTb+5A/SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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