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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5d29bd5ab2c95aacbe8f9b5aee7a3411cf3ef0fe7dc8c3a667b8780060743c' 
  AND token = 'xLL5SfpCaHKcS2dhNCXkVWKChukb5NFhI4wO7dkTbCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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