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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a8b1eec4833952fbe4ec74a6d453d81796eb802b901a1134e8f3e947be58ddb' 
  AND token = 'Kz7d7cM6ptx57tcuDz0iKrO/8e+xOu8TAMyaImKTdeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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