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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe154a18917b2acd9a8650623d27f8d5a1cbd8e78629a1462dc040ae6622c083' 
  AND token = '/RBHUoF5P5pMp9WJxmOYfMTYsXXblM1p+YtbIIp24aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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