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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64ee7bf83408fa769c98367de60b889c63ea0706a9bb885516ac3bc625d182af' 
  AND token = 'Lr6++Y3udYK9A5FCeZjXvEZj4xhWkRCZ0YFlQXcvk9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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