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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30f45317642e8512a3c936fb1ac414f0dc7697e88a057c6f31f54d34aafe84f' 
  AND token = '2hUayXsps7VA8EfAApohLk6wgeZdm6QsGF25xZXkBO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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