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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c7d8ef4ee6347e5fc1bf2a3e1818e0d57e1bf8e5ed64676d0454ce190c5670' 
  AND token = 'E6shruJMB4bl98Q4Y5N9SUoojjdZrMh1NwDshLNyX9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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