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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4741d8e185b7eb75e8e58ea71a800da1f52f916fc5875e38c3154fa3b7d932b' 
  AND token = 'kFBxPS0d9RmVFe2vr68ZlwIeuG0zcfxwpMobEZBaFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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