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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b196976aaaafa7cd1dbee471d0d572911bfbc9ba81c9557f28e4efa40865b0e3' 
  AND token = 'WgQ4EFJoynp+PJJIOVgfDGcP927u/Wgy7Q4KkKjASdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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