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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0ed6d974206937bdae3e7e7e357c79d0717864378499942cf3294c5c838ae8a' 
  AND token = '51Ns+78iqkBBX5Rs5yd6b0nCxgIqPeA05sKXGf3J5Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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