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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3ac54ad4e117181fe420aac8608b3379d718d4cc5d79cc0c450bc30f5d3a31d' 
  AND token = 'BUJQWO57asE/J9tUNkneze2BAP10OA4aeSZlhkOMumE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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