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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24f8d211ff4594e376848e27e75bd0664b4310a8a100858264e5aac7360d6d30' 
  AND token = 'gI5zAapJpxj8YkoUFnF9lkl5UZ0Aa5hehtLWhqlEy3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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