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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf6acc41dfc8a45ad4feb8014286ffa60d6dba556e9c3fa1960a3388d27bcd36' 
  AND token = 'G6w0Csmd1AjLEZ2jlFPlSZofX9yDrjCunQIM6CmfQuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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