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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30262f18bc2ce6fac5ab2f72f91282bb68357db7eecac36e5c12fd9a7f95cd87' 
  AND token = 'UbR991DJahoq+fgwfGW8DdgoIqaHtS2yTHWzelLTOEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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