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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ddd10f7303914daffbc35ef903e95926366028411dff3bf777a9ef74835ee7e' 
  AND token = 'no7iiB4rYibWqUDnIYJ9Rfta5nfFkhJPO3y0DxRCeFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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